test.py

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#!/usr/bin/env python
#
# Copyright 2017 Fraunhofer Institute for Manufacturing Engineering and Automation (IPA)
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.


import time

import rospy
from std_msgs.msg import ColorRGBA

def changeColor():
        pub = rospy.Publisher('light_controller/command', ColorRGBA, queue_size=1)
        rospy.init_node('light_test')
        #color in rgb color space ranging from 0 to 1
        red = ColorRGBA()
        red.r = 1
        red.g = 0
        red.b = 0
        red.a = 1

        yellow = ColorRGBA()
        yellow.r = 0.4
        yellow.g = 1
        yellow.b = 0
        yellow.a = 1

        green = ColorRGBA()
        green.r = 0
        green.g = 1
        green.b = 0
        green.a = 1

        blue = ColorRGBA()
        blue.r = 0
        blue.g = 0
        blue.b = 1
        blue.a = 1

        white = ColorRGBA()
        white.r = 0.3
        white.g = 1
        white.b = 0.3
        white.a = 1

        for color in [red,yellow,green,white,blue,green]:
                rospy.loginfo("Setting rgb to %s [%d, %d, %d]",color.r,color.g,color.b,color.a)
                pub.publish(color)
                time.sleep(3)

if __name__ == '__main__':
    try:
        changeColor()
    except rospy.ROSInterruptException: pass